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a
b
a
Cartridge
b
Strainer
c
Calibration screw
1 Unscrew the plastic cover of the pressure reducing valve.
2 Extract the cartridge with the aid of long nosed pliers to grip the
head of the set screw.
3 Remove the strainer element.
4 Clean the strainer element and cartridge under clean running
water.
5 Replace if the strainer or cartridge are damaged.
6 Refit the strainer, cartridge and cover.
7 If the cartridge has been replaced, calibrate the pressure
reducing valve:
▪ Close the downstream isolating valve (field supply).
▪ Install an Allen key on the calibration screw in the centre of
the plastic cover. Rotate it clockwise to increase the outlet
pressure and anticlockwise to reduce it.
Chemical disinfection
If the applicable legislation requires a chemical disinfection in
specific situations, involving the domestic hot water tank, please be
aware that the domestic hot water tank is a stainless steel cylinder
containing an aluminium anode. We recommend to use a non-
chloride based disinfectant approved for use with water intended for
human consumption.
NOTICE
When using means for descaling or chemical disinfection,
make sure water quality still complies with EU directive
2020/2184.
Descaling
Depending on water quality and set temperature, scale can deposit
on the heat exchanger inside the domestic hot water tank and can
restrict heat transfer. For this reason, descaling of the heat
exchanger may be required at certain intervals.
Drain hose
Check the condition and routing of the drain hose. Water must drain
appropriately from the hose. See
drain" [ 4 10].
the
Fluid pressure
Check whether the fluid pressure is above 1 bar. If it is lower, add
fluid.
EWSAH/X06UD
Daikin Altherma 3 WS
4P675760-1C – 2023.02
c
"4.3.2 To connect the drain hose to
10 Maintenance and service
Pressure relief valve
Open the valve.
CAUTION
Discharge may be very hot.
▪ Check if nothing blocks the fluid in the valve or in between piping.
The fluid flow coming from the relief valve must be high enough.
▪ Check if the fluid coming out from the relief valve is clean. If it
contains debris or dirt:
▪ Open the valve until the discharged water does NOT contain
debris or dirt anymore.
▪ Flush the system and install an additional water filter (preferably
a magnetic cyclone filter).
INFORMATION
It is recommended to perform this maintenance more than
once a year.
Pressure relief valve of the domestic hot water tank
Open the valve.
CAUTION
Water coming out of the valve may be very hot.
▪ Check if nothing blocks the water in the valve or in between
piping. The water flow coming from the relief valve must be high
enough.
▪ Check if the water coming out of the relief valve is clean. If it
contains debris or dirt:
▪ Open the valve until the discharged water does not contain
debris or dirt anymore.
▪ Flush and clean the complete tank, including the piping
between the relief valve and cold water inlet.
To make sure this water originates from the tank, check after a tank
heat up cycle.
INFORMATION
It is recommended to perform this maintenance more than
once a year.
Switch box
Carry out a thorough visual inspection of the switch box and look for
obvious defects such as loose connections or defective wiring.
WARNING
If the internal wiring is damaged, it has to be replaced by
the manufacturer, its service agent or similarly qualified
persons.
Water filter
Close the valve. Clean and rinse the water filter.
NOTICE
Handle the filter with care. To prevent damage to the mesh
of the filter, do NOT use excessive force when you reinsert
it.
2
1
3
Installation manual
41
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